package com.v.LogOutPutFormat;

import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

import java.io.IOException;

//这里需要注意，输出的value为NullWritable
public class LogMapper extends Mapper<LongWritable, Text,Text,NullWritable> {

    @Override
    protected void map(LongWritable key, Text value, Mapper<LongWritable, Text, Text, NullWritable>.Context context) throws IOException, InterruptedException {

        //这里不做任何处理，直接输出


        context.write(value, NullWritable.get());



    }
}
